HPlogo New Features of MPE/iX: Using the Hierarchical File System: 300 MPE/iX Computer Systems > Chapter 3 What's New for System Administrators?

System Management Considerations

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System administrators should be aware of the following considerations concerning MPE/iX at Release 4.5 and 5.0:

Syntax

  • The HPPATH system variable does not accept HFS pathnames. Consequently, you cannot include HFS pathnames in the default search path for a session.

  • Remote file access does not support HFS syntax.

Directories

  • The following types of files can be located only within MPE groups; they cannot be located within HFS directories:

    • UDC files

    • Databases

    • Compatibility mode files (for example, CIR, KSAM, RIO)

Security

  • ACDs are automatically assigned to HFS directories and files residing within those directories. Also, directories and files in root or accounts.

  • You cannot assign ACDs to the root directory, MPE accounts, or MPE groups.

  • Successful logon for users without SM capability requires valid UID and GID entries in the user and group databases.

  • By default, any user can create files in the /tmp directory. This directory is automatically created when you update to Release 4.5 or 5.0. While this behavior is desirable for POSIX-based applications, some system managers may want to restrict access to this directory.

Commands
  • Frequently used MPE commands directly support HFS syntax, some do not.

  • The HELLO and JOB commands only log on to a group.

  • The FILE command allows HFS pathnames only on the right side of the equation.

  • You should use the DISKUSE command instead of the REPORT command to report on disk usage of HFS directories that exist outside groups and accounts.

Groups
  • Databases are supported only in MPE groups.

  • Compatibility mode files can reside only in MPE groups.

Accounting

  • MPE account or group-level accounting does not extend to directories residing outside of accounts.

System management tasks remain essentially the same with Release 5.0. Tasks such as system startup and shutdown, system configuration, system logging, adding user accounts and groups all work the same with some minor enhancements to access HFS features. By default, existing MPE/iX commands and intrinsics assume MPE syntax. You must deliberately activate new features to use them.

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